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APPLIES TO:
2013
2016
2019
Subscription Edition
SharePoint in Microsoft 365
The CKEditor4 (CK4), which was the core text editor in SharePoint Server, reached its end-of-life as of 2023. This means that it no longer receives updates, security patches, or technical support. Given the increasing reliance on modern web technologies and the need for enhanced security, performance, it is important to migrate to a newer, supported version of the text editor. CKEditor5 (CK5) is the natural successor, offering significant improvements over its predecessor.
In this upgrade, we replaced CK4 with CK5 as the core text editor in both the Text Web Parts and the Events Web Parts. The functional interface remains unchanged, ensuring a seamless transition for users.
Note
Currently, we only replace the text editor to CK5 in new-create web parts, and stay using CK4 in the old web parts. In the future, we will replace all the web parts based on CK4 to CK5.
How to Use
Text web part
Create a modern site page.
Click "+" to add new web part, choose Text.
Verify that this web part is based on CK5.

Events web part
Create a modern site page.
Click "+" to add new web part, choose Events.
Fill the title in this web part, then publish this page.
Click "Add event".
Verify that in the "About this event" area, the Text Editor is based on CK5.

The Impact on User Interface/Interaction
The upgrade to CK5 introduces the following changes:
Format toolbar position
In text web part based on CK4, the position of the toolbar changes with the text you select.

If you select text in the text web part based on CK5, the toolbar appears in the upper left corner of the editor's viewable area.

Table
When you create table in CK4 web part, the width of this table column is fixed and does not change as the width of the editor changes.

When you create a table in CK5 web part, the width of the table column varies proportionally with the width of the editor. And you can manually adjust the width of the table column.

Image paste
When you paste an image in CK4 web part, it splits this web part to three web parts: text web part 1 with the content before the position you paste, image web part with the image you paste, text web part 2 with the content after the position you paste.
When you paste an image in CK5 web part, it pastes into the editor directly. See New enhancements for the Text web part.